Intake vacuum line question - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 06-24-2015, 02:48 PM   #1
Newb
Thread Starter
 
Join Date: May 2015
Posts: 14
Total Cats: -2
Default Intake vacuum line question

Non turbo but I figured you guys would know since most cold side intercooler piping is straight into the manifold.
Doing a true cold air intake (rerouting the AFM/MAF) so that it never crosses in front of the engine where hot air can be absorbed. However, on the OEM intake piping before the maf, there are three hoses, all of which I assume are just vacuum lines. Is it common to just plug these off and not have a second thought or do I need to continue trying to figure out how to have the piping and maintain these hose connections.
KamikazeDrifting is offline   Reply With Quote
Old 06-24-2015, 02:54 PM   #2
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,992
Total Cats: 1,457
Default

<p>If it is before the MAF then it isn't vacuum. Where do the 3 hoses run. Picture?</p>
aidandj is offline   Reply With Quote
Old 06-24-2015, 02:59 PM   #3
Newb
Thread Starter
 
Join Date: May 2015
Posts: 14
Total Cats: -2
Default

I will grab a photo shortly, one goes to the valve cover, the other goes into the throttle body. Didn't see where the third goes
KamikazeDrifting is offline   Reply With Quote
Old 06-24-2015, 03:00 PM   #4
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,992
Total Cats: 1,457
Default

<p>Valve cover is crankcase venting.&nbsp;</p>
aidandj is offline   Reply With Quote
Old 06-24-2015, 03:01 PM   #5
Newb
Thread Starter
 
Join Date: May 2015
Posts: 14
Total Cats: -2
Default

Oh and to clarify these are right after the throttle body, so between the intake resonator and throttle body incase I was misleading
KamikazeDrifting is offline   Reply With Quote
Old 06-24-2015, 03:03 PM   #6
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,992
Total Cats: 1,457
Default

<p>Umm yeah thats not before the maf...</p>
aidandj is offline   Reply With Quote
Old 06-24-2015, 03:11 PM   #7
Newb
Thread Starter
 
Join Date: May 2015
Posts: 14
Total Cats: -2
Default

Quote:
Originally Posted by aidandj View Post
<p>Umm yeah thats not before the maf...</p>
My apologies was thinking backwards for some reason.

Here is a reference photo
Attached Thumbnails
Intake vacuum line question-80-2015_06_24_12_11_32_33990fdc798491b9b992902ec1e7a289d6d1cd98.jpg  
KamikazeDrifting is offline   Reply With Quote
Old 06-24-2015, 03:14 PM   #8
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,992
Total Cats: 1,457
Default

<p>Left side is idle valve. Right side is a resonator or something I think. Middle is crank case ventilation. You need all of them if running stock ecu. Maybe not the resonator thing.</p>
aidandj is offline   Reply With Quote
Old 06-24-2015, 03:21 PM   #9
Newb
Thread Starter
 
Join Date: May 2015
Posts: 14
Total Cats: -2
Default

Quote:
Originally Posted by aidandj View Post
<p>Left side is idle valve. Right side is a resonator or something I think. Middle is crank case ventilation. You need all of them if running stock ecu. Maybe not the resonator thing.</p>
I've seen some guys run a mini filter mini directly on the inlet on the crank case, I assume that they are able to because of a tune or would it act the same as taping into the intake piping
I'll likely retain all three then and just implement it into my new piping
KamikazeDrifting is offline   Reply With Quote
Old 06-24-2015, 03:24 PM   #10
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,992
Total Cats: 1,457
Default

<p>Idle valve 100% needs to be there. Resonator pipe will be gone when you remove the stock intake. You should have seen that already. Aren't you turboing? So you will have an ECU anyways.</p>
aidandj is offline   Reply With Quote
Old 06-24-2015, 03:27 PM   #11
Newb
Thread Starter
 
Join Date: May 2015
Posts: 14
Total Cats: -2
Default

Quote:
Originally Posted by aidandj View Post
<p>Idle valve 100% needs to be there. Resonator pipe will be gone when you remove the stock intake. You should have seen that already. Aren't you turboing? So you will have an ECU anyways.</p>
Won't be able to run a turbo setup for about two more months till I can restore the savings I had for a turbo. I've only got two events before then likely so I'm just looking for some stuff to keep me busy till then
KamikazeDrifting is offline   Reply With Quote
Old 06-24-2015, 03:29 PM   #12
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,992
Total Cats: 1,457
Default

<p>cold side piping is a waste on a stock motor. Just wait until you turbo.</p>
aidandj is offline   Reply With Quote
Old 06-24-2015, 05:50 PM   #13
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 113
Default

Stock plumbing or force feed, nothing else is worth it. Leave the PCV valve cover breather plumed into the intake AFTER the AFM meter, otherwise it will leak a bit of unmetered air.

The resonator makes torque down low, and you won't make anything better than it, seriously, leave it alone.
deezums is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:48 AM.